Revealing mistake: Mama's eyes twitch as Arnie is bouncing up and down on her bed, even though she's supposed to be dead. Later, when the kids are around her in a vigil, she is very obviously breathing.

Revealing mistake: During the rainstorm, after Gilbert delivers Becky and her groceries back to the camper, they are embracing in the rain and hoping that Nana won't get the camper started. You can see sunlight reflecting off the truck, their hair and their shoulders, even though they are standing in a supposed downpour with a completely cloudy sky.

During the scene where Darlene Cates (Mama) climbed the staircase, she climbed only the first two or three steps. This footage was reused to show her climbing the entire staircase. The room which served as her upstairs bedroom was actually a downstairs room.